But even though darkening is natural, it can also be a symptom of larger health issues. The result is for the skin on a man's penis and nipples and a woman's areolas and labia, to darken. Coronavirus tests are being shipped to over US labs in an effort to speed diagnosis of the infection as Is the EU holding up Britain's coronavirus response? Those hormones regulate melanocytes — which are skin cells that produce melanin, said Dr Cameron Rokhsar, an associate clinical professor of dermatology at Mt. In childhood a person generally has lighter pigmentation all over — regardless of race.
Alessandra. Age: 22.
The change in pigmentation largely occur because sex hormones stimulate production of melanin during puberty.
Charleigh. Age: 23.
Why your penis and nipples are darker than the rest of your skin
But, when puberty kicks in, women experience an increase in estrogen, while men experience an influx of testosterone. As sex hormones surge through the body they stimulate the production of melanin - the amino acid responsible for hair and skin color. The views expressed in the contents above are those of our users and do not necessarily reflect the views of MailOnline.